Pressor.



v PATENTED JAN. 15, 1907. A. H. GIBSON.

PRESSOR. APPLICATION FILED Anale. 1905.

2 SHEETS-SHEET- l.

A. H. GIBSON.

PRBSSOR. APPLIoA'rIoN FILED AUq.12.19o5.

PATENTED JAN, 15, 1907.

2 SHEETS-SHEET 2.

5 ton 6 is litted to slide.

entre.; sterne ARTHUR H. GlBSGN, OF EASTON, PENNSYLVANIA, ASSIGNOR yTO THE lXGERSOLL-SERGEANT DRlLL COMPANY. OE NEW YORK, N. Y., A- CORBORATI N F WEST VIRGINIA.

Patisserie.'

specification of Letters raient.

Patented Jap; 15, 1907.

Application tiled August 12, 1905. Serial 110.273.924.

resident of Easton, in the county of North-l ampt on and State of Pennsylvania, have invented a new and useful Improvement in Pressors, of' which the'foll'owing is a specification.

The object of my present invention is to provide certain improvements in pressois which are especially adapted for use in connection with percussive tools, the presser' and` its motor being portable and being connected with the percussive tool by means of flexible tubes through which columns of air are reci procated for operating the tool. This invention is particularly directed to improved means for keeping the pressure of the motive fluid raised aslight amount above atmospheric pressure, so as to facilitate the oper ation of the percussive tool.

ln the accompanying drawings, Figure 1 represents the pressor and its motor, partially in longitudinal vertical section and'partially in side elevation; and Fig. 2 is ahorizontal longitudinali section through the resso in the plane of the line A A, Fig. 1,` ooking in the direction of the arrows, the motor being shown in top plan.

The pressor-.cylinder is denoted by 1, its front head by 2, and its back head fby 3. The back head 3 is extended rearwardly, as shown at 4, to form a tubular extension in which the hollow trunk 5 of the pressoris- The crank-shafl) is denoted by 7, and it is connected to the interior of the )iston-trunk 5'by a pitman-rod 8. The Granit-shaft 7 is mounted in a closed crank-shaft casing 9. The motor for driving the presser is herein represented as an ele.- tric motor 10, its shaft 11 being provided with a pinion ,12, which meshes with a gear 13, fixed to the crank-shaft 7 of the presser. Flexible tubes 14 and 15 lead from ports 16 flexible tubes are intended to be connected to the percussive-tooid @linden (Not shown herein.)

The pressor'and motor are firmly mounted on a portable platform 18, as-follows: The front head 2 of the presser-cylinder is provided with bracket extensions 19, which are and 17 in the front and rear heads 2" and 3,1

respectively, of the pressor-cylinder, which" .'sures inthe two spaces.

bolted to the platform 18, and the motor is provided with a base 20, which is bolted to the said platform.

A bridge-port 21 is formed in the inner wall of the presser-cylinder 1, which port is "of `suflticient length to bridge the head of the piston 6 and so arranged that communication between the spaces at' the front and back of the piston is established when the piston is ata point a short distance from the A outer limit of its stroke.

An inlet-port 22 is formed in the pressercylinder 1 at a point midway betweenthe front and back heads 2 and 43, which port is arranged to be alternately opened to the front and back sides of the pressor-.piston'as the piston is reciprocated. A non-return inlet-valve 23 controls the admission of air to the port 22, the casing 24 of which valve is secured to the presser-cylinder. A hollow above the valve 23. Communication to the interior of this cap 25 tibovek the non-return inlet-valve 23 is established -from the external atmosphere through a non-return inlet- Avalve 26, the casing 27 of which is secured to the cap 25.' 'Communication is established from the interior of the crank-shaft casing 9 to the interior of the cap 25 between the inner and outer inlet -yalves 23 and 26 by means of a pipe 28.

In 0peration,supposing the piston to be in the osition shown in the accompanying drawings, as the piston moves forwardly air will be drawn through the inlet-valve 26, cap 25, and pipe 28 into the interior of the crankshaft casing 9. At the same time the columns of air will be forced out through the tube14 from in front of the piston, and columns of air Jfrom the tube 1.5 will be drawn into the space back of the piston. As the piston passes the bridge-port 21 open communication will be established for a short time between the' spaces to the front and back of the piston, t us equalizing the presmovement of the piston will close communication from the front to the back thereof, and the remaining air in front of the piston will be forced .out through the tube 14.

cap .25 is secured to the inlet-valve casing 24 The further forward l IOO As the piston starts on its inward movement it will force the air back ofthe iston out through the tube 15 and draw'in t e air I slightlyt erein.

from the tube 14. At the same time the pressure of the air in the crankshaft-casing 9 will be raised to a slight degree, 4.and as soon as the piston-head opens the port 22 to the space 1n front of the piston the air compressed in the 'crank-shaft casing will pass through the valve 23 into the space in front of the iston," thus raising the pressure As thev piston in its inward movement passes over the bridge-port 21 there will be a momentary communication between'the spaces in front and back of the piston, thus again equalizing the'pressures on the two sides vof the piston. lThis equalizing of pressures upon opposite sides of the iston by the bridge-port 21 is neces-sary, as t e dev1ce herein show'n for connecting the interior of the crank-casing with the interior of the presser-cylinder is arranged to raise the pressure on .the front side only ofthe piston.

It is to bey understood that'by arranging the bridge-port 21 at different distances from the ends of the cylinder the pressures may be equalized in front and back of the piston at different points during its movements. instance, if the bridge-port 21 was arranged at the outer end of the cylinder practically noair would pass one wa whereas a very large amount of air wou d pass the' other Y share.

way. A point exists between the two heads where the side which receives no from the crank-easing can be made to secure its proper In the accompanying draw-ings the bridge-port is shown as locatedin the proper position to obtain this result.

What I claim as my invention is- 1.'A A presser-cylinder, its iston,.iiuid`.pres sure ports upon opposite sides .ofthe piston, a crank-shaft. casing, a passage leading from the `crank-shaft casing to the presser-cylinder at a point which will open `the passage alternately to the opposite sides of the piston -as it reciprocates, a valve for Iopening and .closing communication between the interior of the crank-shaft lcasing .and the interior of the presser-cylinder and a valve for opening and closing communication from the external ,atmosphere to the interior of the crankn shaft casing. y

.2. A presser-cylinder, its piston, fluid-pressure ports upon opposite sides of the piston, a closed crank-shaft casing, a passage leading j from the crank-shaft vcasing to the -pressorcylinder, a valve for opening and closing communicationbetween the interior of the crank-shaft casing and the interior of the presser-cylinder, a valve for opening and closing communication `frornthe external atmosphere to' the interior of the crank-shaft casing and a bridge-port in the presser-cylinder for opening communication from one to the other side of the presser-piston at a predetermined point in its movement.

For I a closedzcra 3. A pressor-cylinder, its piston, fluid-pres- Y vsure ports upon opposite sides of the piston;

a closed crank-shaft casing, an inlet-port in Athe cylinder arranged in position to be alternately opened to the oppositesides of the piston as it reciprocates, a non-return inletvalve therefor, a passage leading from the crank-shaft casing to the said valve land-a and closing communication from thejexternal atmosphere to the said passage interme-.

diate the'rst-named shaft casing. n

4. A presser-cylinder, a hollow trunk-piston therefor, fluid-pressure ports upon o posite sides of thepiston, a closed crank-s aft casing in open communication with the piston-trunk, a passage leading from the closed crank-shaft casing to the presser-cylinder, at

valve and the cranka point which will open the passage alternately to the vopposite sides of Athe piston as it reciprocates, a non-return inlet-valve therein and a second non-return inlet-valve for .opening and closing communication .passage intermediate the Aiirst-nx'rmed valve and the crank-shaft casing.

5. A pressor-cylinder,.its p1ston,uidpres l sure ports u on opposite sides ofthe piston,

-sha t casing, anon-returninlet- .second non-return inlet-valve for opening valve having its port located in 'the pressorcylinder intermediate the ends-thereof, `a

hollow cap above the inlet-valve, a second non-return inlet-valve for o ening and closing .communication from t e external atmosphere to the interior vor said cap and a pipe leading from lche interior of the .crankshaft casingto the interior of the said cap between the two valves.

ICO

6. Apressor-cylinder, its piston, fluid-pres- 'y sure ports u on opposite si es of the piston, aclosed cra -shaft casing, a non-returninletvalve having its port located .inthe pressor-l cylinder intermediate the ends thereof, a hollow capA above the inlet-valve, a second non-return inlet-valve for opening .and closing 'communication from the external atmosphere tothe interior of. said cap, a ipe leading from the interior of the crank-s aft casing to the interior of the said capbetween the two valves and a bridge-port in the inner wall of the pressor-cylinder arranged to open communication from one to the other side of the piston when the piston is at a predetermined point in its movement.

In testimony that'I claim the foregoing as my invention I have signed my name, in presence. of two witnesses, this 10th day ot August, 1905. l

, ARTHUR H. GIBSON. Witnesses H.' D. MAXWELL, FRANK vP. McCLUsKEY. 

